# msg = "hello %s" % "world"
# print(msg)
# print(f"hello {msg}")
#
# a = 2.343
# b = 20000
# print(f"a = %2.1f" % (a))
# print(f"b = %7.1d" % (b))
#
# def a():
#     return (3,2,1)
# b = a()
# print(type(b))
#
# for x in b:
#     print(x)

# num = [4,6,2,1,7,8,0]
num = [["aa",11],["bb",22],["cc",15]]

